What causes "Unique constraint violation - hibernate_sequence reset after each restart" in BRMS 5.3 ?

Solution Verified - Updated -

Issue

  • After restart of a BRMS instance, when trying to restart a process from the jBPM console, the following error is encountered:
2012-06-28 16:01:31,101 ERROR [org.hibernate.util.JDBCExceptionReporter] (http-127.0.0.1-8080-2) ERROR: duplicate key value violates unique constraint "processinstancelog_pkey"
  Detail: Key (id)=(2) already exists.
2012-06-28 16:01:31,102 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] (http-127.0.0.1-8080-2) Could not synchronize database state with session
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update

Connecting to the PostgreSQL database reveals the current value of hibernate_sequence is always reset to 1 after restarting the BRMS instance.

Environment

  • Red Hat JBoss BRMS (BRMS)
    • 5.3.x

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